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planaria is d animal of group flatworm,and have simple tubular excretory system..

caled protonephridium..

it is d system of cosed tubules without internal openings and spread all over in body..branches are capped by a cellular setup termed as flame cells..

each flaME cell has tuft of cillia..beating of cillia propels interstitial fluid into tubules..which is drained into excretory ducts which is open to d exterior through several nephridiopores..!!

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